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From: Simon Glass <sjg@chromium.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v4 4/4] usb: dwc2 : invalidate dcache before starting DMA
Date: Thu, 14 Jul 2016 21:20:29 -0600	[thread overview]
Message-ID: <CAPnjgZ2C5H=d2uekZGVroBw_wb+FKrEpDMuWiH2AVx1wcsZaKw@mail.gmail.com> (raw)
In-Reply-To: <1468479155-1796-5-git-send-email-xzy.xu@rock-chips.com>

On 14 July 2016 at 00:52, Ziyuan Xu <xzy.xu@rock-chips.com> wrote:
> From: Xu Ziyuan <xzy.xu@rock-chips.com>
>
> Invalidate dcache before starting the DMA to ensure coherency. In case
> there are any dirty lines from the DMA buffer in the cache, subsequent
> cache-line replacements may corrupt the buffer in memory while the DMA
> is still going on. Cache-line replacement can happen if the CPU tries to
> bring some other memory locations into the cache while the DMA is going
> on.
>
> Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
>
> ---
>
> Changes in v4: None
> Changes in v3:
> - New commit since v3 to fix the coherence issue between memory and
> cache
>
> Changes in v2: None
>
>  drivers/usb/gadget/dwc2_udc_otg_xfer_dma.c | 3 +++
>  1 file changed, 3 insertions(+)

Acked-by: Simon Glass <sjg@chromium.org>

  reply	other threads:[~2016-07-15  3:20 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-14  6:52 [U-Boot] [PATCH v4 0/4] rockchip: rk3288: add fastboot support Ziyuan Xu
2016-07-14  6:52 ` [U-Boot] [PATCH v4 1/4] usb: rockchip-phy: implement USB2.0 phy control Ziyuan Xu
2016-07-15  3:20   ` Simon Glass
2016-07-15  3:56     ` Simon Glass
2016-07-14  6:52 ` [U-Boot] [PATCH v4 2/4] usb: dwc2-otg: adjust fifo size via platform data Ziyuan Xu
2016-07-15  3:20   ` Simon Glass
2016-07-15  3:56     ` Simon Glass
2016-07-16  5:43       ` Marek Vasut
2016-07-16 20:59         ` Simon Glass
2016-07-14  6:52 ` [U-Boot] [PATCH v4 3/4] rockchip: rk3288: add fastboot support Ziyuan Xu
2016-07-14 11:06   ` William.wu
2016-07-14 15:51     ` Ziyuan Xu
2016-07-14 16:26   ` [U-Boot] [PATCH v4.1 " Ziyuan Xu
2016-07-15  3:20     ` Simon Glass
2016-07-15 14:05       ` Ziyuan Xu
2016-07-15 14:38         ` Simon Glass
2016-07-16 22:31       ` Simon Glass
2016-07-14  6:52 ` [U-Boot] [PATCH v4 4/4] usb: dwc2 : invalidate dcache before starting DMA Ziyuan Xu
2016-07-15  3:20   ` Simon Glass [this message]
2016-07-15  3:56     ` Simon Glass

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